chore(PocketIC): use sequence numbers as state labels #15544

Job	Run time
Bazel Test All	14m 33s
Bazel Build All Config Check	3m 41s
Bazel Build Fuzzers	2m 26s
Bazel Build Fuzzers AFL	3m 18s
Bazel Test macOS Intel	0s
Build IC	14m 0s
Python CI Tests	1m 50s
Bazel Test Coverage	0s
Cargo Build Release Linux	4m 16s
Cargo Clippy Linux	3m 18s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	18s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	16s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	18s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	15s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	17s
	48m 46s

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